Their signal is much stronger than a handheld radio, therefore less affected by obstacles. Radio waves generally won't pass through metal or hills at all. For mounted antennas, it's important to mount your antenna on the highest point possible. The trade-off you are making is longer distance (VHF), vs avoiding possible "dead spots" in and around structures (UHF). 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Also, mount your antenna in a straight-up position, not at an angle. Compare that to a handheld two-way radio which uses between 1/2 - 5 watts. If you are near the edge of your range and experiencing a weak signal, Most commercial VHF and UHF radios have two or more power modes. Metal is not your friend when it comes to radio communications. The key factors affecting communication range are: antenna, obstructions, signal strength (wattage), and signal type. Radios signals are sometimes blocked by solid objects. Installed in vehicles, they run off the vehicle's battery. See what a difference antenna height can make? Handheld radios have 2 common types of antennas: stubby and whip. Compatible with other analog radios within the same frequency band. Vertex VX-2200 VHF 50-Watt Radio [AC061N132-VX], Skip to the beginning of the images gallery, Usually Processed In 2 to 3 Business Days. Let's discuss each of these. Consider some of the new technologies listed in the next section. A stronger signal is capable of withstanding successive passes through obstacles, allowing it to travel farther. The calculation of distances is based on the height of your antenna. BTECH Mobile GMRS-50X1 50 Watt GMRS Two-Way Radio, GMRS Repeater Capable, with Dual Band Scanning Receiver (136-174.99MHz (VHF) 400-520.99MHz (UHF)) 4.3 out of 5 stars 85 $199.89 The distance to the horizon is the maximum communication range for most two-way radios. As you can see, UHF is better at navigating through the smaller spaces within a building to reach it's destination. Unlike frequencies below 2MHz, radio waves in these higher frequencies travel in straight lines (called "line-of-sight" signals), and generally cannot travel beyond the horizon. Did you notice the glass door has a metal mesh with very small holes? For the best experience on our site, be sure to turn on Javascript in your browser. We place orders daily with our partners and in many cases have equipment already in route to our warehouse. Moreover, handheld radios run off a small battery, so a higher wattage would mean your batteries will not last very long. However, in remote areas with no cell coverage these radios will not work. In fact, when trying to increase your range, increasing your antenna height is a more effective way to extend your range than increasing your power, you get more bang for your buck (so to speak). Use a better antenna! As we don’t specialize in HAM radios, I can’t answer this, but something to consider is frequency range. The advantage, or disadvantage, is your radios work anywhere cell phone coverage exists. The two frequency ranges (also called "frequency bands") used in most two-way radios are VHF (Very High Frequency), and UHF (Ultra High Frequency). One benefit of radios with SSB channels is additional power. IP radios work well for businesses wanting to communicate within locations covered by their computer network. The metal mesh keeps the microwaves from passing outside the oven. Orders placed before 3:00 p.m. EST for in-stock items will be processed the same day. The stronger the signal strength, the more it can withstand weakening when it passes through obstacles. Most of these radios act like normal two way radios, but they work differently. So mount your antenna as high-up on your vehicle as possible. Emergency alert for enhanced driver safety. First, not all radio signals are the same. Uniden PRO401HH Professional Series 40 Channel Handheld CB Radio, 4 Watts Power with Hi/Low Power Switch, Auto noise cancellation, Belt Clip And Strap Included, 2.75in. Radio waves generally won't pass through it. Another consideration is hills. Other handheld radios such as marine, aviation, and licensed land-based radios such as: LMR, Ham, & GRMS are limited to 5 watts, again radios with SSB can have 12 watts. CB radios, and some HAM frequencies, are in the HF (High Frequency) range of 29-54MHz, giving them some of these qualities. If you have offices on the same computer network, radios from one office can talk to the other locations, even if these offices are thousands of miles apart. But marine radios have a big advantage, there are no obstacles on the open water! A mobile radio, which has between 25 and 50 watts of output power, is hooked up to the mains or to a car battery and is a pretty substantial radio. IP radios require a controller, which is connected to your network. Mobile radios usually broadcast from 25 to 100 watts maximum. So if the antenna height is at 6 feet tall (1.82880 meters), times the horizon (3.569), equals 4.83 kilometers, or 2.99 miles away. The key words in the advertisement are "up to". Also, the denser an object, the more it reduces the signal strength. Base station antennas are located on the roof of a building, and commercial broadcast antennas are usually located on mountain tops or very high towers. However, each time a radio signal passes through an object the signal strength is reduced. For the best experience on our site, be sure to turn on Javascript in your browser. Beachwood Merchandising Corporation © 2012-2020 All Rights Reserved. Not all antennas on handheld radios are the same. To see product price, add this item to your cart. This maximum range is more theoretical than realistic. If out of range more than 2 minutes, the radio senses no signal and beeps to alert the user. The Iridium satellite constellation is a system of 66 active satellites (and 9 spares in space) used for worldwide voice and data communication from hand-held satellite devices and other transceiver units. For any given antenna height use this formula: Horizon at Ground Level (in kilometers) = 3.569 multiply by the square root of the Antenna Height (in meters). you ask. Antenna type can have a significant effect on range. Their biggest advantage is to extend the communication range beyond the capabilities of an RF system, but it's important to understand the differences, advantages, and disadvantages of each. 4424 Bragg Blvd., Suite 101Fayetteville, NC 28303, Only registered users can write reviews. Assumes standard equipment. you ask. Remote listen can be used by the dispatcher/operator to hear what is going on in the vehical when the driver is not responsive. No. Installed in vehicles, they run off the vehicle's battery. For example, a 25-watt marine radio will roughly have a maximum range of 60 nautical miles (111 km) between antennas mounted on tall ships, but that same radio will only have a range of 5 nautical miles (9 km) between antennas mounted on small boats at sea level. If you must have a longer range than most radios can provide, then consider either buying a repeater, contacting a repeater service, or look to satellite, network, or LTE radios. VHF frequencies can penetrate objects better than UHF. Satellite radios communicate through an array of satellites know as the Iridium satellite constellation. Most two-way radios used today have a frequency range somewhere within 130MHz to 900MHz (except CB & Ham radios). Be sure your. You often see ads for two-way radios saying "up to 36 miles" or more. If you’re looking for a … Commercial radio stations typically broadcast at 50,000 or 100,000 watts. If you search for reviews on these same radios, you will find many disappointed people saying they can't get anywhere close to the advertised range. Satellite radios require a monthly service fee for the satellite usage. The two most commonly used frequency ranges for two-way radios are VHF (Very High Frequency 130-174MHz), and UHF (Ultra High Frequency 400-520MHz).